2. WorldMapper: The World As You've Never Seen It Before (from @plennig)WorldMapper contains 366 maps, all available as PDF posters, which provide a visual representation of global data. Categories include movement, transportation, poverty, housing, education, pollution and religion, among others. For example, you can view a map of worldwide secondary education spending, passenger car distribution and the increase of carbon emmisions between 1980 and 2000 (see below).

Again, thanks to everyone in my Twitter and Plurk networks who gave me suggestions. (I've saved a bunch for future posts.)